CVE-2026-43900— DeepChat: Persistent DOM XSS via HTML Entity Encoding in `<antArtifact>` SVG Rendering (Bypass of `svgSanitizer.ts`)

DeepChat: Persistent DOM XSS via HTML Entity Encoding in `<antArtifact>` SVG Rendering (Bypass of `svgSanitizer.ts`)

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, a Cross-Site Scripting (XSS) vulnerability exists due to a discrepancy between the backend validation layer and the frontend browser rendering engine. The SVGSanitizer (src/main/lib/svgSanitizer.ts) restricts script execution by scrubbing javascript: protocols using plain-text regular expressions. However, it fails to account for HTML entity decoding prior to Vue's v-html DOM insertion inside the SvgArtifact.vue component. By feeding an SVG artifact with obfuscated entities (e.g., j&#x61;vascript:alert(1)), an attacker can completely bypass the sanitizer, culminating in arbitrary JavaScript execution when a victim interacts with the rendered SVG Element. This vulnerability is fixed in v1.0.4-beta.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

DeepChat 跨站脚本漏洞

DeepChat是ThinkInAIXYZ开源的一款智能助手。 DeepChat v1.0.4-beta.1之前版本存在跨站脚本漏洞，该漏洞源于后端验证层与前端浏览器渲染引擎之间的差异，SVGSanitizer使用纯文本正则表达式清除javascript:协议，但未考虑在Vue的v-html DOM插入之前进行HTML实体解码，攻击者通过提供带有混淆实体的SVG工件可完全绕过清理程序，导致受害者与渲染的SVG元素交互时执行任意JavaScript。

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